Blue lateral magnet assembly



April 21,1970 R. R. MELONE BLUE LATERAL MAGNET ASSEMBLY Filed Jan; 51, 1968 INVENTOR. Roberf R. Me/one United States Patent U.S. Cl. 335212 11 Claims ABSTRACT OF THE DISCLOSURE A retainer for a blue lateral and purity ring magnet assembly to be mounted on the neck of a television tube and including a pair of axially spaced annular mounting members joined together at peripherally spaced areas with each mounting member having peripherally spaced radially extending shoulder means disposed therearound for mounting therebetween a pair of blue lateral ring magnets on one mounting member and a pair of purity ring magnets on the other mounting member, and further including tube clamping members disposed between the mounting members with means to secure the same together in position for mounting the retainer and assembled ring magnets on the neck of a television tube.

The invention relates to new and useful improvements in means for mounting a blue lateral and purity ring magnet assembly on the neck of color television tubes.

Purity ring magnets are known and comprise a pair of flat magnetic rings mounted in face-to-face relationship coaxially about the neck of the tube. The rings are magnetically polarized with discrete poles at spaced circumferential positions and are rotatable relative to one another and as a unit for the desired corrections. The lateral magnets are also in the form of flat rings which are adjustable equally and oppositely about an axis eccentric With respect to the axis of the tube and which have magnetic poles at 60 intervals. The direction of rotation determines the direction of magnetic correction about a null point, and the degree of rotation determines the strength of the magnetic field, thus effecting lateral convergence of the blue beam with the red and green electron gun beams. Reference is made to my prior Patent No. 3,332,046, dated July 18, 1967, in this connection.

An object of the present invention is to provide a retainer having means for mounting the lateral and purity ring magnets for relative adjustment thereof and to provide clamping means therebetween for mounting the same on the neck of a television tube.

Another object of the invention is to provide a retainer substantially of the above type having a pair of annular mounting members with circumferentially and axially spaced shoulder means trapping the respective ring magnets thereon for relative rotational adjustment.

A further object of the invention is to provide a retainer substantially of the above type formed of integral plastic material with the clamping members hingedly included therewith to secure the mounting members on the neck of a television tube with the purity ring magnets coaxial with the axis thereof and with the lateral ring magnets eccentric with respect to the axis thereof.

The invention still further aims to provide a retainer substantially of the above type which is relatively simple in construction and capable of being molded in a two plate mold, without side action for relatively inexpensive manufacture.

The above and other objects of the invention will in part be obvious and will be hereinafter more fully pointed out.

In the accompanying drawing:

FIG. 1 is a perspective view showing the retainer and 3,508,181 Patented Apr. 21, 1970 ring magnet assembly mounted on the neck of a television tube;

FIG. 2 is a sectional view across the tube looking in the direction of the lateral ring magnets and showing the same in a zero or null position;

FIG. 3 is a sectional view across the tube looking in the direction of the purity ring magnets shown in the zero or null position;

FIG. 4 is a side elevation of FIG. 3;

FIG. 5 is a view similar to FIG. 2 showing the retainer ring magnets in a position of maximum rotational adjustment;

FIG. 6 is an end elevation of the retainer with the purity ring mounting member outermost;

FIG. 7 is a side elevation of FIG. 6; and

FIGS. 8 and 9 are fragmentary perspective views of modified forms of securing means for the clamping members.

Referring to FIG. 1, there is shown a television tube 10 having a reduced neck portion 10a on which the retainer and lateral and purity ring magnets are assembled. With particular reference to FIGS. 4, 6 and 7, the retainer is illustrated as including two annular magnet mounting members 14, 16 which are axially spaced from one another along the length of the tube neck. These mounting members are joined at the tops thereof by a saddle-like portions 18 and oppositely thereto by an axially extending strut 20 connected at its inner end to the mounting member 16 and having a depending leg 22 connected to the mounting member 14. Thus, the central axes of the annular mounting members 14, 16 are radially oifset with respect to one another and the mounting member 14 is mounted eccentrically with respect to the axis of the tube neck and the mounting member 16 is mounted concentrically with respect to the axis of the tube neck. In the space between the two annular members 14, 16 there are integral arcuate clamping arms 24, 24a each having an integral hinge connection. 25, 25a with upstanding projections 26, 26a, respectively, on the saddle portion 18. The opposite ends' of the clamping arms are provided with depending end portions 27, 27a which are apertured or otherwise configured to effect a clamping together of the ends of the clamping arms when mounting the retainer on the tube neck. For this purpose, the intermediate inner portions of the clamping arms are each provided with pressure pad portions 28, 28a, to engage the tube neck. In addition, the saddle portion 18 is provided with an inwardly projecting axial rib 29 which also bears against the adjacent surface of the tube neck. There is thus provided rather free circulation of air along the tube surface to prevent overheating although the retainer is adequately mounted thereon against rotational or axial movement.

The lateral ring magnets 30, 30a are carried by the annular mounting member 14 and the purity ring magnets 31, 31a are carried by the annular mounting member 16. For further description of the manner in which these ring magnets are mounted, reference is still made to FIGS. 4, 6 and 7. The annular mounting member 16 includes a pair of spaced radial projections 33, 33a each terminating in an axially projecting shoulder portion 34, 34a. In addition, there are peripherally spaced axial projections 36, 36a, 36b each presenting axially inclined shoulder surfaces 37, 37a, 3712, respectively, and each terminating in inwardly projecting radial stop shoulders (see 39 in FIG. 7). These stop shoulders are radially spaced from the outward shoulders 34, 34a, and serve to trap therebetween the two purity magnets 31, 31a which may be snapped on the mounting member 16 by forcing the same over the inclined surfaces of the axial portions 37, 37a, 3712. Similarly, the annular mounting member 14 includes a pair of radially extending formations 40, 40a each terminating in an axially outwardly projecting shoulder portion '41, 41a, respectively. A portion of the strut 22 depends, as at 44, and terminates in an additional axially projecting shoulder portion 45. In addition, there are provided axially extending spaced fingers 46, 46a, 46b each having inclined camming surfaces (see 47, 47a in FIG. 7) which terminate in inwardly facing projecting radial stop shoulders (see 48 in FIG. 7). Between these stop shoulders and the axial shoulders 41, 41a, 45, the blue lateral ring magnets 30, 30a are trapped after these magnets are forced onto the retainer 14 by passing the same over the inclined surfaces of the axially extending fingers 46, 46a, 46b.

Assuming the lateral ring magnets 30, 30a have been assembled on the mounting member 14 by forcing the same over the inclined camming surfaces of the spring fingers 46, 46a, 46b and that the purity ring magnets 31, 31a have been similarly mounted on the mounting member 16 by snapping the same over the cam surfaces of the spring fingers 36, 36a, 36b, these ring magnets are now mounted for relative rotational adjustment about the tube axis when the assembly is mounted on the tube neck. For mounting purposes, the assembly is passed over the tube neck with the saddle rib 29 bearing against the surface thereof. The clamping arms 24, 24a are then brought together about the tube neck with the pressure surfaces 28, 28a bearing thereagainst. The end portions 27, 27a of the clamping arms are apertured to receive a suitable fastening means, such as the bolt 48 (see FIG. 3), passing through the aperture in the end portion 27 and threadedly engaging a U-shaped metal clip 49 of conventional form which is engaged over the other end portion 27a and which is provided with thread formations to threadedly receive the end of the bolt 48. The lateral ring magnet 30 is provided with outward and inward radial protuberances 50, 50a, respectively (see FIG. 2), and the lateral ring magnet 30a is provided with similar protuberances 52, 52a (see FIG. When these protuberances are aligned with one another, such as centrally with respect to the saddle rib 29, as shown in FIG. 2, the ring magnets are at a null position. The forward edge of the saddle 18 terminates short of the forward edge of the mounting member 14 leaving a gap so that the adjacent edges of the mounting member 14 provide stop shoulders 54, 54a as shown in FIGS. 2 and 5.

The lateral ring magnet 30 is provided with outward and angled finger tabs 56, 57 and the lateral ring magnet 30a is provided with similar finger tabs 56a, 57a. The tabs 56, 56a are arranged in pairs as are the tabs 57, 5711 so that they may be finger grasped for adjustment. The limit of adjustment from the neutral position of FIG. 2 is shown in FIG. 5 where the inward protuberance 50a abuts the stop shoulder 54 and the inward protuberance 52a on the ring magnet 30a abuts the stop shoulder 54a. In similar manner, the purity ring magnets 31, 31a are provided with similar protuberances 59, 59a, respectively, which can be aligned in a neutral position as in FIG. 1. The purity ring magnets are also provided with outward and angled finger tabs 60, 60a by which they can be manipulated for adjustment. After the retainer and the assembled ring magnets are mounted on the neck of the television tube, adjustment by a serviceman can be made in an extremely simple manner. For example, the serviceman can grasp either the top or bottom pair of tabs 56, 56a or 57, 57a of the blue lateral ring magnets to rotate the same in equal and opposite directions for adjusting the beam. In like manner, the purity ring magnets can be adjusted. When the clamping arms are secured by the bolt 48, it will be noted that the depending terminal ends 27, 27a of the clamping arms are disposed within the depending portion 22 and its extension 44 of the strut 20 which joins the two annular mounting members 14, 16. Thus, the securing means for the clamping arms is disposed substantially within the outer extent of the larger lateral ring magnets so as not to increase space requirements for the assembly. Certain additional forms of securing means are shown in FIGS. 8 and 9. In FIG. 8, the

clamping arm 61 has a depending portion 62 which is slotted as at 63, to receive an arrowhead type of fastener 64 projecting from the depending portion 65a of the other clamping arm 65. In FIG. 9 the depending portion 62 of arm 61 and the depending portion 65a of clamping arm 65 are provided with slots which extend in opposite directions, opening through the opposite edges but which will overlap in the center to provide a through bore when aligned. Into this bore is telescoped a rivet-like member 66 which can be peened over to fasten the clamping arms in fixed relation. The advantage of the opposed slots is that the entire mounting member assembly can be injection molded in a two-plate mold.

While certain forms of the invention have been shown for purposes of illustration, it is to be clearly understood that various changes in the details of construction and arrangement of parts may be made without departing from the spirit and scope of the invention as set forth in the appended claims.

I claim:

1. A one piece plastic ring magnet retainer to be mounted on the neck of a television tube and adapted to support for relative rotation a pair of lateral ring magnets and a pair of purity ring magnets disposed around the axis of the tube neck;.and comprising a pair of annular magnet mounting members to be disposed around the tube neck, connecting means at peripherally spaced points for integrally joining together said mounting members in axially spaced relationship, peripherally spaced radial shoulder means on each of said magnet mounting members with certain of the shoulder means on each magnet mounting member spaced axially of one another and facing inwardly of the associated magnet mounting member for trapping therebetween the lateral ring magnets on one magnet mounting member and the purity ring magnets on the other magnet mounting member, and clamping means hingedly attached to the connecting means and movable into clamping position engaging the tube neck for mounting the retainer thereon with the assembled ring magnets.

2. A ring magnet retainer as claimed in claim 1, wherein the clamping means includes a pair of arcuate arms with interengaging securing means at the free ends thereof.

3. A ring magnet retainer as claimed in claim 2, wherein the arcuate arms are disposed in the spaces between said magnet mounting members.

4. A ring magnet retainer as claimed in claim 3, wherein the arcuate arms are provided with intermediate inwardly projecting pressure surfaces to engage the tube neck.

5. A ring magnet retainer as claimed in claim 1, wherein the magnet mounting members have the center axes thereof offset radially with respect to one another, and wherein the means securing together said mounting members includes an axially extending strut connected to the mounting member for the purity ring magnets and a depending portion connected to the lower adjacent edge of the mounting member for the lateral ring magnets.

6. A ring magnet retainer as claimed in claim 5, wherein the clamping means includes a pair of arcuate arms with interengaging securing means at the free ends thereof disposed within the confines of said strut member and the depending portion thereof.

7. A ringmagnet retainer as claimed in claim 1, in combination with a pair of lateral ring magnets carried by one mounting member and a pair of purity ring magnets carried by the other mounting member, and wherein the lateral ring magnets include radial protuberances which may be aligned in a null position thereof, and wherein there are provided spaced shoulder portions on the mounting member for the lateral ring magnets cooperating by abutment with said protuberances to limit relative adjustment therebetween from the null position.

8. A one-piece plastic ring magnet retainer to be mounted on the neck of a television tube and adapted to support for relative rotation a pair of lateral ring magnets and a pair of purity ring magnets disposed around the axis of the tube neck; and comprising a pair of axially spaced annular magnet mounting members to be disposed around the tube neck, an arcuate saddle portion connecting the upper edges of said mounting members and adapted to engage the tube neck, a strut member connecting said mounting members substantially opposite to said saddle portion, peripherally spaced radial shoulder means on each of said magnet mounting members with certain of the shoulder means on each magnet mounting member spaced axially of one another and facing inwardly of the associated magnet mounting member for trapping therebetween the lateral ring magnets on one magnet mounting member and the purity ring magnets on the other magriet mounting member, and a pair of clamping arms each having an integral hinge connection with said saddle portion and movable into clamping position engaging the tube neck and carrying fastener means at the free ends thereof for securing the same in clamping position.

9. A one-piece plastic ring magnet retainer as claimed in claim 8, wherein one of the mounting members is oilset radially with respect to the other mounting member with the mounting members substantially coincident in the region of said saddle portion, and wherein said strut member includes a longitudinal portion connected to one mounting member and a depending portion connected to the adjacent portion of the offset mounting member, and wherein the fastener means at the free ends of the clamp depending portion thereof.

References Cited UNITED STATES PATENTS 3,332,046 7/1967 Melone 335-212 3,191,135 6/1965 Hazelquist 336-65 2,885,568 5/1959 Mech 313-76 FOREIGN PATENTS 717,908 2/ 1942 Germany.

OTHER REFERENCES Netherlands Printed Application, 6,604,197, November 1966, Illinois Tool Works, 335-210.

BERNARD A. GILHEANY, Primary Examiner D. M. MORGAN, Assistant Examiner U.S. Cl. X.R. 313-77 

